On Wed, 12 May 2010, Maria McKinley wrote: > Hi there, > > I have a problem with my mail program hanging when too many processes > are spawned by cyrus. The problem seems to occur when the maxchild limit > is reached. I was wondering what is suppose to happen when the maxchild > limit is reached, because at this point, I have to restart cyrus when > this happens. What would happen if I removed the maxchild limit > entirely? The Maxchild limit is there to protect your servers from overloading if you have misbehaving clients or abusive users. If your server can handle a higher setting, feel free to increase the value. You may need to increase the ulimits on your cyrus process as well. My Cyrus servers set the following in the /etc/init.d/cyrus script: # Crank up the limits ulimit -n 209702 ulimit -u 4096 ulimit -c 102400 and I have the following service entries in /etc/cyrus.conf: imap cmd="/usr/local/cyrus/bin/imapd" listen="imap" prefork=10 maxchild=2000 imaps cmd="/usr/local/cyrus/bin/imapd -s" listen="imaps" prefork=10 maxchild=1500 This is a VMWare guest with 4 vcpus and 6GB of RAM. If you remove the Maxchild setting entirely, eventually your Cyrus process will run into the process limits (ulimits) anyways, and may fail in exciting ways. It's better to let Cyrus limit itself. Andy ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
